/// <summary>
/// Test a local header against that provided from the central directory
/// </summary>
/// <param name="entry">
/// The entry to test against
/// </param>
/// <param name="tests">The type of <see cref="HeaderTest">tests</see> to carry out.</param>
/// <returns>The offset of the entries data in the file</returns>
private long TestLocalHeader(ZipEntry entry, HeaderTest tests)
{
lock (baseStream_)
{
bool testHeader = (tests & HeaderTest.Header) != 0;
bool testData = (tests & HeaderTest.Extract) != 0;
baseStream_.Seek(offsetOfFirstEntry + entry.Offset, SeekOrigin.Begin);
if ((int) ReadLEUint() != ZipConstants.LocalHeaderSignature)
{
throw new ZipException(string.Format("Wrong local header signature @{0:X}", offsetOfFirstEntry + entry.Offset));
}
short extractVersion = (short) ReadLEUshort();
short localFlags = (short) ReadLEUshort();
short compressionMethod = (short) ReadLEUshort();
short fileTime = (short) ReadLEUshort();
short fileDate = (short) ReadLEUshort();
uint crcValue = ReadLEUint();
long compressedSize = ReadLEUint();
long size = ReadLEUint();
int storedNameLength = ReadLEUshort();
int extraDataLength = ReadLEUshort();
byte[] nameData = new byte[storedNameLength];
StreamUtils.ReadFully(baseStream_, nameData);
byte[] extraData = new byte[extraDataLength];
StreamUtils.ReadFully(baseStream_, extraData);
ZipExtraData ed = new ZipExtraData(extraData);
// Extra data / zip64 checks
if (ed.Find(1))
{
// TODO Check for tag values being distinct.. Multiple zip64 tags means what?
// Zip64 extra data but 'extract version' is too low
if (extractVersion < ZipConstants.VersionZip64)
{
throw new ZipException(
string.Format("Extra data contains Zip64 information but version {0}.{1} is not high enough",
extractVersion/10, extractVersion%10));
}
// Zip64 extra data but size fields dont indicate its required.
if (((uint) size != uint.MaxValue) && ((uint) compressedSize != uint.MaxValue))
{
throw new ZipException("Entry sizes not correct for Zip64");
}
size = ed.ReadLong();
compressedSize = ed.ReadLong();
}
else
{
// No zip64 extra data but entry requires it.
if ((extractVersion >= ZipConstants.VersionZip64) &&
(((uint) size == uint.MaxValue) || ((uint) compressedSize == uint.MaxValue)))
{
throw new ZipException("Required Zip64 extended information missing");
}
}
if (testData)
{
if (entry.IsFile)
{
if (!entry.IsCompressionMethodSupported())
{
throw new ZipException("Compression method not supported");
}
if ((extractVersion > ZipConstants.VersionMadeBy)
|| ((extractVersion > 20) && (extractVersion < ZipConstants.VersionZip64)))
{
throw new ZipException(string.Format("Version required to extract this entry not supported ({0})", extractVersion));
}
if ((localFlags & (int) (GeneralBitFlags.Patched | GeneralBitFlags.StrongEncryption | GeneralBitFlags.EnhancedCompress | GeneralBitFlags.HeaderMasked)) != 0)
{
throw new ZipException("The library does not support the zip version required to extract this entry");
}
}
}
if (testHeader)
{
if ((extractVersion <= 63) && // Ignore later versions as we dont know about them..
(extractVersion != 10) &&
(extractVersion != 11) &&
(extractVersion != 20) &&
(extractVersion != 21) &&
(extractVersion != 25) &&
(extractVersion != 27) &&
(extractVersion != 45) &&
(extractVersion != 46) &&
(extractVersion != 50) &&
(extractVersion != 51) &&
(extractVersion != 52) &&
(extractVersion != 61) &&
(extractVersion != 62) &&
(extractVersion != 63)
)
{
throw new ZipException(string.Format("Version required to extract this entry is invalid ({0})", extractVersion));
}
// Local entry flags dont have reserved bit set on.
if ((localFlags & (int) (GeneralBitFlags.ReservedPKware4 | GeneralBitFlags.ReservedPkware14 | GeneralBitFlags.ReservedPkware15)) != 0)
{
throw new ZipException("Reserved bit flags cannot be set.");
}
// Encryption requires extract version >= 20
if (((localFlags & (int) GeneralBitFlags.Encrypted) != 0) && (extractVersion < 20))
{
throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion));
}
// Strong encryption requires encryption flag to be set and extract version >= 50.
if ((localFlags & (int) GeneralBitFlags.StrongEncryption) != 0)
{
if ((localFlags & (int) GeneralBitFlags.Encrypted) == 0)
{
throw new ZipException("Strong encryption flag set but encryption flag is not set");
}
if (extractVersion < 50)
{
throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion));
}
}
// Patched entries require extract version >= 27
if (((localFlags & (int) GeneralBitFlags.Patched) != 0) && (extractVersion < 27))
{
throw new ZipException(string.Format("Patched data requires higher version than ({0})", extractVersion));
}
// Central header flags match local entry flags.
if (localFlags != entry.Flags)
{
throw new ZipException("Central header/local header flags mismatch");
}
// Central header compression method matches local entry
if (entry.CompressionMethod != (CompressionMethod) compressionMethod)
{
throw new ZipException("Central header/local header compression method mismatch");
}
// Strong encryption and extract version match
if ((localFlags & (int) GeneralBitFlags.StrongEncryption) != 0)
{
if (extractVersion < 62)
{
throw new ZipException("Strong encryption flag set but version not high enough");
}
}
if ((localFlags & (int) GeneralBitFlags.HeaderMasked) != 0)
{
if ((fileTime != 0) || (fileDate != 0))
{
throw new ZipException("Header masked set but date/time values non-zero");
}
}
if ((localFlags & (int) GeneralBitFlags.Descriptor) == 0)
{
if (crcValue != (uint) entry.Crc)
{
throw new ZipException("Central header/local header crc mismatch");
}
}
// Crc valid for empty entry.
// This will also apply to streamed entries where size isnt known and the header cant be patched
if ((size == 0) && (compressedSize == 0))
{
if (crcValue != 0)
{
throw new ZipException("Invalid CRC for empty entry");
}
}
// TODO: make test more correct... can't compare lengths as was done originally as this can fail for MBCS strings
// Assuming a code page at this point is not valid? Best is to store the name length in the ZipEntry probably
if (entry.Name.Length > storedNameLength)
{
throw new ZipException("File name length mismatch");
}
// Name data has already been read convert it and compare.
string localName = ZipConstants.ConvertToStringExt(localFlags, nameData);
// Central directory and local entry name match
if (localName != entry.Name)
{
throw new ZipException("Central header and local header file name mismatch");
}
// Directories have zero size.
if (entry.IsDirectory)
{
if ((compressedSize != 0) || (size != 0))
{
throw new ZipException("Directory cannot have size");
}
}
if (!ZipNameTransform.IsValidName(localName, true))
{
throw new ZipException("Name is invalid");
}
}
// Tests that apply to both data and header.
// Size can be verified only if it is known in the local header.
// it will always be known in the central header.
if ((localFlags & (int) GeneralBitFlags.Descriptor) == 0 ||
(size != 0 || compressedSize != 0))
{
if (size != entry.Size)
{
throw new ZipException(
string.Format("Size mismatch between central header({0}) and local header({1})",
entry.Size, size));
}
if (compressedSize != entry.CompressedSize)
{
throw new ZipException(
string.Format("Compressed size mismatch between central header({0}) and local header({1})",
entry.CompressedSize, compressedSize));
}
}
int extraLength = storedNameLength + extraDataLength;
return offsetOfFirstEntry + entry.Offset + ZipConstants.LocalHeaderBaseSize + extraLength;
}
}
/// <summary>
/// Complete cleanup as the final part of closing.
/// </summary>
/// <param name="testCrc">True if the crc value should be tested</param>
private void CompleteCloseEntry(bool testCrc)
{
StopDecrypting();
if ((flags & 8) != 0)
{
ReadDataDescriptor();
}
size = 0;
if (testCrc &&
((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1))
{
throw new ZipException("CRC mismatch");
}
crc.Reset();
if (method == (int) CompressionMethod.Deflated)
{
inf.Reset();
}
entry = null;
}
/// <summary>
/// Make a new <see cref="ZipEntry"/> from a name.
/// </summary>
/// <param name="fileName">The name of the file to create a new entry for.</param>
/// <param name="useFileSystem">If true entry detail is retrieved from the file system if the file exists.</param>
/// <returns>Returns a new <see cref="ZipEntry"/> based on the <paramref name="fileName"/>.</returns>
public ZipEntry MakeFileEntry(string fileName, bool useFileSystem)
{
ZipEntry result = new ZipEntry(nameTransform_.TransformFile(fileName));
result.IsUnicodeText = isUnicodeText_;
int externalAttributes = 0;
bool useAttributes = (setAttributes_ != 0);
FileInfo fi = null;
if (useFileSystem)
{
fi = new FileInfo(fileName);
}
if ((fi != null) && fi.Exists)
{
switch (timeSetting_)
{
case TimeSetting.CreateTime:
result.DateTime = fi.CreationTime;
break;
case TimeSetting.CreateTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = fi.CreationTime.ToUniversalTime();
#else
result.DateTime = fi.CreationTimeUtc;
#endif
break;
case TimeSetting.LastAccessTime:
result.DateTime = fi.LastAccessTime;
break;
case TimeSetting.LastAccessTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = fi.LastAccessTime.ToUniversalTime();
#else
result.DateTime = fi.LastAccessTimeUtc;
#endif
break;
case TimeSetting.LastWriteTime:
result.DateTime = fi.LastWriteTime;
break;
case TimeSetting.LastWriteTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = fi.LastWriteTime.ToUniversalTime();
#else
result.DateTime = fi.LastWriteTimeUtc;
#endif
break;
case TimeSetting.Fixed:
result.DateTime = fixedDateTime_;
break;
default:
throw new ZipException("Unhandled time setting in MakeFileEntry");
}
result.Size = fi.Length;
useAttributes = true;
externalAttributes = ((int) fi.Attributes & getAttributes_);
}
else
{
if (timeSetting_ == TimeSetting.Fixed)
{
result.DateTime = fixedDateTime_;
}
}
if (useAttributes)
{
externalAttributes |= setAttributes_;
result.ExternalFileAttributes = externalAttributes;
}
return result;
}
/// <summary>
/// Opens a Zip file reading the given <see cref="Stream"/>.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> to read archive data from.</param>
/// <exception cref="IOException">
/// An i/o error occurs
/// </exception>
/// <exception cref="ZipException">
/// The file doesn't contain a valid zip archive.<br/>
/// The stream provided cannot seek
/// </exception>
public ZipFile(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanSeek)
{
throw new ArgumentException("Stream is not seekable", "stream");
}
baseStream_ = stream;
isStreamOwner = true;
if (baseStream_.Length > 0)
{
try
{
ReadEntries();
}
catch
{
DisposeInternal(true);
throw;
}
}
else
{
entries_ = new ZipEntry[0];
isNewArchive_ = true;
}
}
/// <summary>
/// Gets an input stream for reading the given zip entry data in an uncompressed form.
/// Normally the <see cref="ZipEntry"/> should be an entry returned by GetEntry().
/// </summary>
/// <param name="entry">The <see cref="ZipEntry"/> to obtain a data <see cref="Stream"/> for</param>
/// <returns>An input <see cref="Stream"/> containing data for this <see cref="ZipEntry"/></returns>
/// <exception cref="InvalidOperationException">
/// The ZipFile has already been closed
/// </exception>
/// <exception cref="ZipException">
/// The compression method for the entry is unknown
/// </exception>
/// <exception cref="IndexOutOfRangeException">
/// The entry is not found in the ZipFile
/// </exception>
public Stream GetInputStream(ZipEntry entry)
{
if (entry == null)
{
throw new ArgumentNullException("entry");
}
if (entries_ == null)
{
throw new InvalidOperationException("ZipFile has closed");
}
long index = entry.ZipFileIndex;
if ((index < 0) || (index >= entries_.Length) || (entries_[index].Name != entry.Name))
{
index = FindEntry(entry.Name, true);
if (index < 0)
{
throw new ZipException("Entry cannot be found");
}
}
return GetInputStream(index);
}
private Stream CreateAndInitEncryptionStream(Stream baseStream, ZipEntry entry)
{
CryptoStream result = null;
if ((entry.Version < ZipConstants.VersionStrongEncryption)
|| (entry.Flags & (int) GeneralBitFlags.StrongEncryption) == 0)
{
PkzipClassicManaged classicManaged = new PkzipClassicManaged();
OnKeysRequired(entry.Name);
if (HaveKeys == false)
{
throw new ZipException("No password available for encrypted stream");
}
// Closing a CryptoStream will close the base stream as well so wrap it in an UncompressedStream
// which doesnt do this.
result = new CryptoStream(new UncompressedStream(baseStream),
classicManaged.CreateEncryptor(key, null), CryptoStreamMode.Write);
if ((entry.Crc < 0) || (entry.Flags & 8) != 0)
{
WriteEncryptionHeader(result, entry.DosTime << 16);
}
else
{
WriteEncryptionHeader(result, entry.Crc);
}
}
return result;
}
public ZipEntryEnumerator(ZipEntry[] entries)
{
array = entries;
}
/// <summary>
/// Get an output stream for the specified <see cref="ZipEntry"/>
/// </summary>
/// <param name="entry">The entry to get an output stream for.</param>
/// <returns>The output stream obtained for the entry.</returns>
private Stream GetOutputStream(ZipEntry entry)
{
Stream result = baseStream_;
if (entry.IsCrypted)
{
#if NETCF_1_0
throw new ZipException("Encryption not supported for Compact Framework 1.0");
#else
result = CreateAndInitEncryptionStream(result, entry);
#endif
}
switch (entry.CompressionMethod)
{
case CompressionMethod.Stored:
result = new UncompressedStream(result);
break;
case CompressionMethod.Deflated:
DeflaterOutputStream dos = new DeflaterOutputStream(result, new Deflater(9, true));
dos.IsStreamOwner = false;
result = dos;
break;
default:
throw new ZipException("Unknown compression method " + entry.CompressionMethod);
}
return result;
}
public ZipUpdate(string fileName, ZipEntry entry)
{
command_ = UpdateCommand.Add;
entry_ = entry;
filename_ = fileName;
}
private int FindExistingUpdate(ZipEntry entry)
{
int result = -1;
string convertedName = GetTransformedFileName(entry.Name);
if (updateIndex_.ContainsKey(convertedName))
{
result = (int) updateIndex_[convertedName];
}
/*
// This is slow like the coming of the next ice age but takes less storage and may be useful
// for CF?
for (int index = 0; index < updates_.Count; ++index)
{
ZipUpdate zu = ( ZipUpdate )updates_[index];
if ( (zu.Entry.ZipFileIndex == entry.ZipFileIndex) &&
(string.Compare(convertedName, zu.Entry.Name, true, CultureInfo.InvariantCulture) == 0) ) {
result = index;
break;
}
}
*/
return result;
}
internal void SetEntry(ZipEntry entry)
{
entry_ = entry;
entryValid_ = true;
bytesTested_ = 0;
}
private int WriteCentralDirectoryHeader(ZipEntry entry)
{
if (entry.CompressedSize < 0)
{
throw new ZipException("Attempt to write central directory entry with unknown csize");
}
if (entry.Size < 0)
{
throw new ZipException("Attempt to write central directory entry with unknown size");
}
if (entry.Crc < 0)
{
throw new ZipException("Attempt to write central directory entry with unknown crc");
}
// Write the central file header
WriteLEInt(ZipConstants.CentralHeaderSignature);
// Version made by
WriteLEShort(ZipConstants.VersionMadeBy);
// Version required to extract
WriteLEShort(entry.Version);
WriteLEShort(entry.Flags);
unchecked
{
WriteLEShort((byte) entry.CompressionMethod);
WriteLEInt((int) entry.DosTime);
WriteLEInt((int) entry.Crc);
}
if ((entry.IsZip64Forced()) || (entry.CompressedSize >= 0xffffffff))
{
WriteLEInt(-1);
}
else
{
WriteLEInt((int) (entry.CompressedSize & 0xffffffff));
}
if ((entry.IsZip64Forced()) || (entry.Size >= 0xffffffff))
{
WriteLEInt(-1);
}
else
{
WriteLEInt((int) entry.Size);
}
byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);
if (name.Length > 0xFFFF)
{
throw new ZipException("Entry name is too long.");
}
WriteLEShort(name.Length);
// Central header extra data is different to local header version so regenerate.
ZipExtraData ed = new ZipExtraData(entry.ExtraData);
if (entry.CentralHeaderRequiresZip64)
{
ed.StartNewEntry();
if ((entry.Size >= 0xffffffff) || (useZip64_ == UseZip64.On))
{
ed.AddLeLong(entry.Size);
}
if ((entry.CompressedSize >= 0xffffffff) || (useZip64_ == UseZip64.On))
{
ed.AddLeLong(entry.CompressedSize);
}
if (entry.Offset >= 0xffffffff)
{
ed.AddLeLong(entry.Offset);
}
// Number of disk on which this file starts isnt supported and is never written here.
ed.AddNewEntry(1);
}
else
{
// Should have already be done when local header was added.
ed.Delete(1);
}
byte[] centralExtraData = ed.GetEntryData();
WriteLEShort(centralExtraData.Length);
WriteLEShort(entry.Comment != null ? entry.Comment.Length : 0);
WriteLEShort(0); // disk number
WriteLEShort(0); // internal file attributes
// External file attributes...
if (entry.ExternalFileAttributes != -1)
{
WriteLEInt(entry.ExternalFileAttributes);
}
else
{
if (entry.IsDirectory)
{
WriteLEUint(16);
}
else
{
WriteLEUint(0);
}
}
if (entry.Offset >= 0xffffffff)
{
WriteLEUint(0xffffffff);
}
else
{
WriteLEUint((uint) (int) entry.Offset);
}
if (name.Length > 0)
{
baseStream_.Write(name, 0, name.Length);
}
if (centralExtraData.Length > 0)
{
baseStream_.Write(centralExtraData, 0, centralExtraData.Length);
}
byte[] rawComment = (entry.Comment != null) ? Encoding.ASCII.GetBytes(entry.Comment) : new byte[0];
if (rawComment.Length > 0)
{
baseStream_.Write(rawComment, 0, rawComment.Length);
}
return ZipConstants.CentralHeaderBaseSize + name.Length + centralExtraData.Length + rawComment.Length;
}
/// <summary>
/// Delete a <see cref="ZipEntry"/> from the archive.
/// </summary>
/// <param name="entry">The entry to delete.</param>
public void Delete(ZipEntry entry)
{
CheckUpdating();
int index = FindExistingUpdate(entry);
if (index >= 0)
{
contentsEdited_ = true;
updates_[index] = null;
updateCount_ -= 1;
}
else
{
throw new ZipException("Cannot find entry to delete");
}
}
/// <summary>
/// Add a <see cref="ZipEntry"/> that contains no data.
/// </summary>
/// <param name="entry">The entry to add.</param>
/// <remarks>This can be used to add directories, volume labels, or empty file entries.</remarks>
public void Add(ZipEntry entry)
{
if (entry == null)
{
throw new ArgumentNullException("entry");
}
CheckUpdating();
if ((entry.Size != 0) || (entry.CompressedSize != 0))
{
throw new ZipException("Entry cannot have any data");
}
AddUpdate(new ZipUpdate(UpdateCommand.Add, entry));
}
/// <summary>
/// Locate the data for a given entry.
/// </summary>
/// <returns>
/// The start offset of the data.
/// </returns>
/// <exception cref="System.IO.EndOfStreamException">
/// The stream ends prematurely
/// </exception>
/// <exception cref="ZipException">
/// The local header signature is invalid, the entry and central header file name lengths are different
/// or the local and entry compression methods dont match
/// </exception>
private long LocateEntry(ZipEntry entry)
{
return TestLocalHeader(entry, HeaderTest.Extract);
}
public ZipUpdate(string fileName, string entryName, CompressionMethod compressionMethod)
{
command_ = UpdateCommand.Add;
entry_ = new ZipEntry(entryName);
entry_.CompressionMethod = compressionMethod;
filename_ = fileName;
}
private Stream CreateAndInitDecryptionStream(Stream baseStream, ZipEntry entry)
{
CryptoStream result = null;
if ((entry.Version < ZipConstants.VersionStrongEncryption)
|| (entry.Flags & (int) GeneralBitFlags.StrongEncryption) == 0)
{
PkzipClassicManaged classicManaged = new PkzipClassicManaged();
OnKeysRequired(entry.Name);
if (HaveKeys == false)
{
throw new ZipException("No password available for encrypted stream");
}
result = new CryptoStream(baseStream, classicManaged.CreateDecryptor(key, null), CryptoStreamMode.Read);
CheckClassicPassword(result, entry);
}
else
{
throw new ZipException("Decryption method not supported");
}
return result;
}
public ZipUpdate(IStaticDataSource dataSource, string entryName, CompressionMethod compressionMethod)
{
command_ = UpdateCommand.Add;
entry_ = new ZipEntry(entryName);
entry_.CompressionMethod = compressionMethod;
dataSource_ = dataSource;
}
private static void CheckClassicPassword(CryptoStream classicCryptoStream, ZipEntry entry)
{
byte[] cryptbuffer = new byte[ZipConstants.CryptoHeaderSize];
StreamUtils.ReadFully(classicCryptoStream, cryptbuffer);
if (cryptbuffer[ZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue)
{
throw new ZipException("Invalid password");
}
}
public ZipUpdate(IStaticDataSource dataSource, ZipEntry entry)
{
command_ = UpdateCommand.Add;
entry_ = entry;
dataSource_ = dataSource;
}
/// <summary>
/// Get a <see cref="Stream"/> providing data for an entry.
/// </summary>
/// <param name="entry">The entry to provide data for.</param>
/// <param name="name">The file name for data if known.</param>
/// <returns>Returns a stream providing data; or null if not available</returns>
public Stream GetSource(ZipEntry entry, string name)
{
Stream result = null;
if (name != null)
{
result = File.OpenRead(name);
}
return result;
}
public ZipUpdate(ZipEntry original, ZipEntry updated)
{
throw new ZipException("Modify not currently supported");
/*
command_ = UpdateCommand.Modify;
entry_ = ( ZipEntry )original.Clone();
outEntry_ = ( ZipEntry )updated.Clone();
*/
}
/// <summary>
/// Initialises a default <see cref="ZipFile"/> instance with no entries and no file storage.
/// </summary>
internal ZipFile()
{
entries_ = new ZipEntry[0];
isNewArchive_ = true;
}
public ZipUpdate(UpdateCommand command, ZipEntry entry)
{
command_ = command;
entry_ = (ZipEntry) entry.Clone();
}
/// <summary>
/// Advances to the next entry in the archive
/// </summary>
/// <returns>
/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries.
/// </returns>
/// <remarks>
/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called.
/// </remarks>
/// <exception cref="InvalidOperationException">
/// Input stream is closed
/// </exception>
/// <exception cref="ZipException">
/// Password is not set, password is invalid, compression method is invalid,
/// version required to extract is not supported
/// </exception>
public ZipEntry GetNextEntry()
{
if (crc == null)
{
throw new InvalidOperationException("Closed.");
}
if (entry != null)
{
CloseEntry();
}
int header = inputBuffer.ReadLeInt();
if (header == ZipConstants.CentralHeaderSignature ||
header == ZipConstants.EndOfCentralDirectorySignature ||
header == ZipConstants.CentralHeaderDigitalSignature ||
header == ZipConstants.ArchiveExtraDataSignature ||
header == ZipConstants.Zip64CentralFileHeaderSignature)
{
// No more individual entries exist
Close();
return null;
}
// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found
// Spanning signature is same as descriptor signature and is untested as yet.
if ((header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature))
{
header = inputBuffer.ReadLeInt();
}
if (header != ZipConstants.LocalHeaderSignature)
{
throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header));
}
short versionRequiredToExtract = (short) inputBuffer.ReadLeShort();
flags = inputBuffer.ReadLeShort();
method = inputBuffer.ReadLeShort();
uint dostime = (uint) inputBuffer.ReadLeInt();
int crc2 = inputBuffer.ReadLeInt();
csize = inputBuffer.ReadLeInt();
size = inputBuffer.ReadLeInt();
int nameLen = inputBuffer.ReadLeShort();
int extraLen = inputBuffer.ReadLeShort();
bool isCrypted = (flags & 1) == 1;
byte[] buffer = new byte[nameLen];
inputBuffer.ReadRawBuffer(buffer);
string name = ZipConstants.ConvertToStringExt(flags, buffer);
entry = new ZipEntry(name, versionRequiredToExtract);
entry.Flags = flags;
entry.CompressionMethod = (CompressionMethod) method;
if ((flags & 8) == 0)
{
entry.Crc = crc2 & 0xFFFFFFFFL;
entry.Size = size & 0xFFFFFFFFL;
entry.CompressedSize = csize & 0xFFFFFFFFL;
entry.CryptoCheckValue = (byte) ((crc2 >> 24) & 0xff);
}
else
{
// This allows for GNU, WinZip and possibly other archives, the PKZIP spec
// says these values are zero under these circumstances.
if (crc2 != 0)
{
entry.Crc = crc2 & 0xFFFFFFFFL;
}
if (size != 0)
{
entry.Size = size & 0xFFFFFFFFL;
}
if (csize != 0)
{
entry.CompressedSize = csize & 0xFFFFFFFFL;
}
entry.CryptoCheckValue = (byte) ((dostime >> 8) & 0xff);
}
entry.DosTime = dostime;
// If local header requires Zip64 is true then the extended header should contain
// both values.
// Handle extra data if present. This can set/alter some fields of the entry.
if (extraLen > 0)
{
byte[] extra = new byte[extraLen];
inputBuffer.ReadRawBuffer(extra);
entry.ExtraData = extra;
}
entry.ProcessExtraData(true);
if (entry.CompressedSize >= 0)
{
csize = entry.CompressedSize;
}
if (entry.Size >= 0)
{
size = entry.Size;
}
if (method == (int) CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size)))
{
throw new ZipException("Stored, but compressed != uncompressed");
}
// Determine how to handle reading of data if this is attempted.
if (entry.IsCompressionMethodSupported())
{
internalReader = InitialRead;
}
else
{
internalReader = ReadingNotSupported;
}
return entry;
}
/// <summary>
/// Copy an existing entry.
/// </summary>
/// <param name="entry">The existing entry to copy.</param>
public ZipUpdate(ZipEntry entry)
: this(UpdateCommand.Copy, entry)
{
// Do nothing.
}
/// <summary>
/// Closes the zip input stream
/// </summary>
public override void Close()
{
internalReader = ReadingNotAvailable;
crc = null;
entry = null;
base.Close();
}
/// <summary>
/// Search for and read the central directory of a zip file filling the entries array.
/// </summary>
/// <exception cref="System.IO.IOException">
/// An i/o error occurs.
/// </exception>
/// <exception cref="ZipException">
/// The central directory is malformed or cannot be found
/// </exception>
private void ReadEntries()
{
// Search for the End Of Central Directory. When a zip comment is
// present the directory will start earlier
//
// The search is limited to 64K which is the maximum size of a trailing comment field to aid speed.
// This should be compatible with both SFX and ZIP files but has only been tested for Zip files
// If a SFX file has the Zip data attached as a resource and there are other resources occuring later then
// this could be invalid.
// Could also speed this up by reading memory in larger blocks.
if (baseStream_.CanSeek == false)
{
throw new ZipException("ZipFile stream must be seekable");
}
long locatedEndOfCentralDir = LocateBlockWithSignature(ZipConstants.EndOfCentralDirectorySignature,
baseStream_.Length, ZipConstants.EndOfCentralRecordBaseSize, 0xffff);
if (locatedEndOfCentralDir < 0)
{
throw new ZipException("Cannot find central directory");
}
// Read end of central directory record
ushort thisDiskNumber = ReadLEUshort();
ushort startCentralDirDisk = ReadLEUshort();
ulong entriesForThisDisk = ReadLEUshort();
ulong entriesForWholeCentralDir = ReadLEUshort();
ulong centralDirSize = ReadLEUint();
long offsetOfCentralDir = ReadLEUint();
uint commentSize = ReadLEUshort();
if (commentSize > 0)
{
byte[] comment = new byte[commentSize];
StreamUtils.ReadFully(baseStream_, comment);
comment_ = ZipConstants.ConvertToString(comment);
}
else
{
comment_ = string.Empty;
}
bool isZip64 = false;
// Check if zip64 header information is required.
if ((thisDiskNumber == 0xffff) ||
(startCentralDirDisk == 0xffff) ||
(entriesForThisDisk == 0xffff) ||
(entriesForWholeCentralDir == 0xffff) ||
(centralDirSize == 0xffffffff) ||
(offsetOfCentralDir == 0xffffffff))
{
isZip64 = true;
long offset = LocateBlockWithSignature(ZipConstants.Zip64CentralDirLocatorSignature, locatedEndOfCentralDir, 0, 0x1000);
if (offset < 0)
{
throw new ZipException("Cannot find Zip64 locator");
}
// number of the disk with the start of the zip64 end of central directory 4 bytes
// relative offset of the zip64 end of central directory record 8 bytes
// total number of disks 4 bytes
ReadLEUint(); // startDisk64 is not currently used
ulong offset64 = ReadLEUlong();
uint totalDisks = ReadLEUint();
baseStream_.Position = (long) offset64;
long sig64 = ReadLEUint();
if (sig64 != ZipConstants.Zip64CentralFileHeaderSignature)
{
throw new ZipException(string.Format("Invalid Zip64 Central directory signature at {0:X}", offset64));
}
// NOTE: Record size = SizeOfFixedFields + SizeOfVariableData - 12.
ulong recordSize = ReadLEUlong();
int versionMadeBy = ReadLEUshort();
int versionToExtract = ReadLEUshort();
uint thisDisk = ReadLEUint();
uint centralDirDisk = ReadLEUint();
entriesForThisDisk = ReadLEUlong();
entriesForWholeCentralDir = ReadLEUlong();
centralDirSize = ReadLEUlong();
offsetOfCentralDir = (long) ReadLEUlong();
// NOTE: zip64 extensible data sector (variable size) is ignored.
}
entries_ = new ZipEntry[entriesForThisDisk];
// SFX/embedded support, find the offset of the first entry vis the start of the stream
// This applies to Zip files that are appended to the end of an SFX stub.
// Or are appended as a resource to an executable.
// Zip files created by some archivers have the offsets altered to reflect the true offsets
// and so dont require any adjustment here...
// TODO: Difficulty with Zip64 and SFX offset handling needs resolution - maths?
if (!isZip64 && (offsetOfCentralDir < locatedEndOfCentralDir - (4 + (long) centralDirSize)))
{
offsetOfFirstEntry = locatedEndOfCentralDir - (4 + (long) centralDirSize + offsetOfCentralDir);
if (offsetOfFirstEntry <= 0)
{
throw new ZipException("Invalid embedded zip archive");
}
}
baseStream_.Seek(offsetOfFirstEntry + offsetOfCentralDir, SeekOrigin.Begin);
for (ulong i = 0; i < entriesForThisDisk; i++)
{
if (ReadLEUint() != ZipConstants.CentralHeaderSignature)
{
throw new ZipException("Wrong Central Directory signature");
}
int versionMadeBy = ReadLEUshort();
int versionToExtract = ReadLEUshort();
int bitFlags = ReadLEUshort();
int method = ReadLEUshort();
uint dostime = ReadLEUint();
uint crc = ReadLEUint();
long csize = ReadLEUint();
long size = ReadLEUint();
int nameLen = ReadLEUshort();
int extraLen = ReadLEUshort();
int commentLen = ReadLEUshort();
int diskStartNo = ReadLEUshort(); // Not currently used
int internalAttributes = ReadLEUshort(); // Not currently used
uint externalAttributes = ReadLEUint();
long offset = ReadLEUint();
byte[] buffer = new byte[Math.Max(nameLen, commentLen)];
StreamUtils.ReadFully(baseStream_, buffer, 0, nameLen);
string name = ZipConstants.ConvertToStringExt(bitFlags, buffer, nameLen);
ZipEntry entry = new ZipEntry(name, versionToExtract, versionMadeBy, (CompressionMethod) method);
entry.Crc = crc & 0xffffffffL;
entry.Size = size & 0xffffffffL;
entry.CompressedSize = csize & 0xffffffffL;
entry.Flags = bitFlags;
entry.DosTime = dostime;
entry.ZipFileIndex = (long) i;
entry.Offset = offset;
entry.ExternalFileAttributes = (int) externalAttributes;
if ((bitFlags & 8) == 0)
{
entry.CryptoCheckValue = (byte) (crc >> 24);
}
else
{
entry.CryptoCheckValue = (byte) ((dostime >> 8) & 0xff);
}
if (extraLen > 0)
{
byte[] extra = new byte[extraLen];
StreamUtils.ReadFully(baseStream_, extra);
entry.ExtraData = extra;
}
entry.ProcessExtraData(false);
if (commentLen > 0)
{
StreamUtils.ReadFully(baseStream_, buffer, 0, commentLen);
entry.Comment = ZipConstants.ConvertToStringExt(bitFlags, buffer, commentLen);
}
entries_[i] = entry;
}
}
/// <summary>
/// Make a new <see cref="ZipEntry"></see> for a directory.
/// </summary>
/// <param name="directoryName">The raw untransformed name for the new directory</param>
/// <param name="useFileSystem">If true entry detail is retrieved from the file system if the file exists.</param>
/// <returns>Returns a new <see cref="ZipEntry"></see> representing a directory.</returns>
public ZipEntry MakeDirectoryEntry(string directoryName, bool useFileSystem)
{
ZipEntry result = new ZipEntry(nameTransform_.TransformDirectory(directoryName));
result.Size = 0;
int externalAttributes = 0;
DirectoryInfo di = null;
if (useFileSystem)
{
di = new DirectoryInfo(directoryName);
}
if ((di != null) && di.Exists)
{
switch (timeSetting_)
{
case TimeSetting.CreateTime:
result.DateTime = di.CreationTime;
break;
case TimeSetting.CreateTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = di.CreationTime.ToUniversalTime();
#else
result.DateTime = di.CreationTimeUtc;
#endif
break;
case TimeSetting.LastAccessTime:
result.DateTime = di.LastAccessTime;
break;
case TimeSetting.LastAccessTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = di.LastAccessTime.ToUniversalTime();
#else
result.DateTime = di.LastAccessTimeUtc;
#endif
break;
case TimeSetting.LastWriteTime:
result.DateTime = di.LastWriteTime;
break;
case TimeSetting.LastWriteTimeUtc:
#if NETCF_1_0 || NETCF_2_0
result.DateTime = di.LastWriteTime.ToUniversalTime();
#else
result.DateTime = di.LastWriteTimeUtc;
#endif
break;
case TimeSetting.Fixed:
result.DateTime = fixedDateTime_;
break;
default:
throw new ZipException("Unhandled time setting in MakeDirectoryEntry");
}
externalAttributes = ((int) di.Attributes & getAttributes_);
}
else
{
if (timeSetting_ == TimeSetting.Fixed)
{
result.DateTime = fixedDateTime_;
}
}
// Always set directory attribute on.
externalAttributes |= (setAttributes_ | 16);
result.ExternalFileAttributes = externalAttributes;
return result;
}
private void ExtractEntry(ZipEntry entry)
{
bool doExtraction = false;
string nameText = entry.Name;
if (entry.IsFile)
{
// TODO: Translate invalid names allowing extraction still.
doExtraction = NameIsValid(nameText) && entry.IsCompressionMethodSupported();
}
else if (entry.IsDirectory)
{
doExtraction = NameIsValid(nameText);
}
// TODO: Fire delegate were compression method not supported, or name is invalid?
string dirName = null;
string targetName = null;
if (doExtraction)
{
// Handle invalid entry names by chopping of path root.
if (Path.IsPathRooted(nameText))
{
string workName = Path.GetPathRoot(nameText);
nameText = nameText.Substring(workName.Length);
}
if (nameText.Length > 0)
{
targetName = Path.Combine(targetDirectory_, nameText);
if (entry.IsDirectory)
{
dirName = targetName;
}
else
{
dirName = Path.GetDirectoryName(Path.GetFullPath(targetName));
}
}
else
{
doExtraction = false;
}
}
if (doExtraction && !Directory.Exists(dirName))
{
if (!entry.IsDirectory || CreateEmptyDirectories)
{
try
{
Directory.CreateDirectory(dirName);
}
catch (Exception ex)
{
doExtraction = false;
if (events_ != null)
{
if (entry.IsDirectory)
{
continueRunning_ = events_.OnDirectoryFailure(targetName, ex);
}
else
{
continueRunning_ = events_.OnFileFailure(targetName, ex);
}
}
else
{
continueRunning_ = false;
}
}
}
}
if (doExtraction && entry.IsFile)
{
ExtractFileEntry(entry, targetName);
}
}
